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Dosimetric properties of a Solid Water High Equivalency (SW557) phantom for megavoltage photon beams

Content Provider	Scilit
Author	Araki, Fujio
Copyright Year	2017
Description	Journal: Physica Medica The dosimetric properties of the recently developed SW557 phantom have been investigated by comparison with those of the existing SW457 phantom in megavoltage photon beams. The electron fluence ratio $φplw, and chamber ionization ratio $k_{pl}$, of water to SW457 and water to SW557 for 4–15MV photons were calculated as a function of depth using Monte Carlo simulations, and compared with measured values. Values ofφplw for SW457 were in the range of 1.004–1.014 for 4MV, and 1.014–1.018 for 15MV photons. Theφplw for SW557 ranged from 1.005 to 1.008 for 4MV and from 1.010 to 1.015 for 15MV photons and the variation ofφplw with depth for each beam energy was within ±0.5%. Values of $k_{pl}$ were obtained with a PTW 30013 Farmer-type ionization chamber. The $k_{pl}$ for SW457 ranged from 0.997 to 1.011 for 4–15MV photons. Values of $k_{pl}$ for SW557 were almost unity for 4 and 6MV photons, while in the case of 10 and 15MV photons they were less than 1.006, excepting the build-up region. The measured and calculated $k_{pl}$ values of water to SW557 were in the range of 0.997–1.002 and 1.000–1.006, respectively, for 4–15MV photons, at a depth of 10cm with a source-to-axis distance of 100cm. The measured and calculated $k_{pl}$ values were in agreement within their uncertainty ranges. As a water-equivalent phantom, SW557 can be used with a dosimetric difference within±0.6%, for 4–15MV photons, and is more water-equivalent than SW457 in megavoltage photon beams.$
Related Links	http://www.physicamedica.com/article/S1120179717302016/pdf
Ending Page	136
Page Count	5
Starting Page	132
ISSN	11201797
DOI	10.1016/j.ejmp.2017.06.011
Journal	Physica Medica
Volume Number	39
Language	English
Publisher	Elsevier BV
Publisher Date	2017-06-26
Access Restriction	Open
Subject Keyword	Journal: Physica Medica Radiology, Nuclear Medicine and Imaging Solid Water 557 Electron Fluence Ratio Chamber Ionization Ratio Monte Carlo Simulation Megavoltage Photon Beam
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Physics and Astronomy Biophysics

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